CN101203401A - Headrest for protecting against whiplash - Google Patents
Headrest for protecting against whiplash Download PDFInfo
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- CN101203401A CN101203401A CNA2006800223662A CN200680022366A CN101203401A CN 101203401 A CN101203401 A CN 101203401A CN A2006800223662 A CNA2006800223662 A CN A2006800223662A CN 200680022366 A CN200680022366 A CN 200680022366A CN 101203401 A CN101203401 A CN 101203401A
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- headrest
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- impact
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- 239000006260 foam Substances 0.000 claims abstract description 83
- 206010071366 Post-traumatic neck syndrome Diseases 0.000 claims abstract description 14
- 208000021567 Whiplash injury Diseases 0.000 claims abstract description 14
- 230000005484 gravity Effects 0.000 claims abstract description 10
- 230000013011 mating Effects 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 10
- 239000004033 plastic Substances 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 9
- 206010008334 Cervicobrachial syndrome Diseases 0.000 claims description 7
- 230000000284 resting effect Effects 0.000 claims description 6
- 230000033001 locomotion Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000013016 damping Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000002829 reductive effect Effects 0.000 claims description 3
- 230000006378 damage Effects 0.000 abstract description 6
- 208000027418 Wounds and injury Diseases 0.000 abstract description 5
- 208000014674 injury Diseases 0.000 abstract description 3
- 208000011580 syndromic disease Diseases 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 9
- 238000005259 measurement Methods 0.000 description 8
- 230000003068 static effect Effects 0.000 description 8
- 230000004913 activation Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 230000004224 protection Effects 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 208000005189 Embolism Diseases 0.000 description 1
- 208000028373 Neck injury Diseases 0.000 description 1
- 208000020339 Spinal injury Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000037396 body weight Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000004886 head movement Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 239000013598 vector Substances 0.000 description 1
- 239000003190 viscoelastic substance Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/80—Head-rests
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/80—Head-rests
- B60N2/888—Head-rests with arrangements for protecting against abnormal g-forces, e.g. by displacement of the head-rest
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Seats For Vehicles (AREA)
- Chair Legs, Seat Parts, And Backrests (AREA)
Abstract
The invention relates to a headrest (10) for a vehicle seat, in particular for a backrest of a motor vehicle seat, said headrest essentially comprising a headrest frame or headrest casing (14) and a foam base body (36) that surrounds the headrest frame or casing (14). In the event of a rear impact on the motor vehicle, the headrest remains fixed in relation to the backrest (conventional headrest) or at least part of the headrest is immediately displaced towards the vehicle occupant (active headrest). According to the invention, the head of a vehicle occupant can be brought into contact with the headrest (10) at least at two different heights (k1z, k2z), (two-point contact), to reduce or neutralise a torque (My) about a y-axis (y-y) in the vicinity of the vertebral column and to prevent accident-related injuries to the seat occupant, in particular to prevent cervical spine syndrome or a whiplash injury in the event of a front and/or rear impact. A head centre of gravity (HCG) is also configured between the two heights (k1z, k2z) of the headrest (10).
Description
Technical field
The present invention relates to a kind of headrest that is used for seat, relate in particular to the headrest that is used for automotive seat, this headrest has the feature that the preorder of claim 1 and 12 is quoted.
Background technology
Traditional crash-active headrest is used for improving the safety of passenger in car accedent.Even and in the rear impact of low velocity of impact, the tradition headrest also has higher injured risk, utilize the crash-active headrest can significantly reduce the risk of a kind of serious cervical spine injury that is called as " whiplash injury effect ", more particularly, reduce the risk of the frequent sample wound that swishes a whip that causes by the overdistension and the unfair stress of cervical vertebra and muscle support system.
The whiplash injury effect is called as " whiplash injury " with the spinal injury in relevant cervical vertebra district.
Compare with the tradition headrest, the crash-active headrest is designed to have big relatively distance under the normal driving condition between head and headrest.This provides maximum traveling comfort (degree of freedom of head movement) all the time under the normal driving condition.Yet if rear impact takes place, the distance between head and the headrest should be minimum value, because this distance plays an important role in cervical vertebra district damage risk.
Known several solution that is used to prevent the activation headrest of cervical vertebra district damage.
The solution of this problem has been proposed at the several files such as DE 198 00 078 and DE 198 50 758, wherein, in rear impact, the mass inertia of Vehicular occupant (" being triggered by health ") partly applies a bigger load to the cushion of seat upholder, and it causes that the supplementary technology parts between the cushion partial sum headrest that is arranged on the seat upholder move headrest in (driving) direction of advancing.Yet the disadvantage that these solutions have is that the safety device of the quality of the dependence Vehicular occupant that is adopted can not guarantee under any circumstance can both activate headrest.Especially when the Vehicular occupant body weight hour, have the risk that safety device when having an accident was not activated or do not reach completeness fully.
In second group of headrest, headrest depends on the additional triggers mechanical device (" external trigger ") that does not rely on Vehicular occupant inertia.
For instance, EP 0 593 845 discloses a kind of headrest that wherein includes airbag, and this airbag by rear sensor control, is activated and expansion in a short period of time by pyrotechnic gas generator in rear impact.Because the distance between head and the headrest can have significant variation, if distance is very little, head is pushed ahead the N/R power on the airbag that is activated.In addition, this set needs rear sensor and pyrotechnic device, thereby quite complicated.
EP 0 825 061 A2 also disclose a kind of device that is used for pivot rotation headrest when rear impact takes place.This device comprises the spiral stretching spring that is integrally formed in the headrest, and this spring loosens in rear impact, let-loose energy pivot rotation supporting member.The pivoting movement of this headrest starts by discharge helical spring inertial sensor with predetermined acceleration, and inertial sensor itself rotates about an axial back pivot with respect to vehicle.Disadvantageously, because the parts setting that activation and pivot rotation headrest and mass inertia separately need, the pivoting movement of headrest needs one inevitably than the long reaction time.Yet this motion must be very fast, is under the situation of absolute condition precedent of safe operation in rapid reaction especially.In the activation of headrest, even several milliseconds time span is to preventing that injured also is vital.
DE 102 60 582 discloses the solution of the crash-active headrest of another kind of more complicated external trigger, and this crash-active headrest can discharge the magnetic holding plate with magnet that receives magnetic pulse when rear impact takes place.
If the generation rear impact, the distance between head and the headrest should remain on the minimum value of the Distance Remaining that is used to provide comfort level, therefore can not eliminate adverse effect fully.
Based on these considerations, no matter whether tradition headrest or activation head restraint systems are used for dealing with problems, the structure of headrest itself especially for preventing cervical spine injury and the risk of the sample wound that swishes a whip, has also been brought into play vital function for desirable protection is provided.
Even when using the tradition headrest or have the headrest of automotive seat activation delivery system, the intelligent design of headrest itself can reduce injured risk to a certain extent.If headrest itself provides enough protections, expensive activation head restraint systems may be eliminated.
Summary of the invention
Because so many research is at activating head restraint systems, the variation of the structure design of headrest own is out in the cold.The present invention is from aforesaid prior art development level, and its purpose is to improve the structure of headrest itself.
Therefore, one object of the present invention is that to headrest features provides solution this scheme can cause reducing head and/or HWS damage, and can use with traditional head restraint systems with activating.This novel headrest that will provide not only can reduce the bounce-back of head on headrest, also can guide head particularly on the x-z plane.
According to an aspect of the present invention, head by the moving vehicle passenger touches headrest (2 supports) with at least two differing heights at headrest, between these height of headrest, to form head center of gravity (HCG), stable also guiding head, reduce the whiplash injury effect, thereby minimizing or counteracting cervical vertebra district are about the moment of torsion (M of y axle (y-y)
y), be used to prevent that contingency from damaging the seat passenger, especially prevent the whiplash injury of impact moment of cervical syndrome and/or front and/or rear.
In the of the present invention first optional embodiment, be guiding head, minimizing or counteracting cervical vertebra district are about the moment of torsion (M of y axle (y-y)
y), and prevent that contingency from damaging the seat passenger, especially prevent cervical syndrome and/or the front and/or rear impact whiplash injury of moment, the foam base plate of described headrest comprises the front portion of foam base plate at least, and thereby on mating surfaces, its stable head (100 when taking place to collide, 100 '), be substantially disposed in first foam and second foam that is substantially disposed in the lower zone of headrest of the upper area of headrest, wherein said foam has different dynamic characteristicss.
In the second optional embodiment, be guiding head, minimizing or counteracting cervical vertebra district are about the moment of torsion (M of y axle (y-y)
y), and prevent that contingency from damaging the seat passenger, especially prevent cervical syndrome and/or the front and/or rear impact whiplash injury of moment, basically at the lower zone of the headrest at the inner mating surfaces place that stablizes head when taking place to collide of foam base plate, impact beam is arranged in the head restraint frame/headrest box of headrest or on it.
According to the 3rd optional embodiment, the first and second optional embodiment can be used in combination.
In a preferred embodiment of the invention, the common ground that all optional embodiment have is, at core or in vertical center plane, can make head " 2 contacts ", that is to say head cross a zone, along a line or contact headrest on one point.
According to a preferred embodiment of the present invention, the foam that in the first optional embodiment, adopts can comprise have different densities and/or steadiness and/or viscosity, and the foam that therefore has the Different Dynamic characteristic.In a preferred embodiment, first foam is compared with second foam and is had lower viscosity and less steadiness.First foam that is arranged on the headrest upper area is therefore more soft than second foam that is arranged on the headrest lower zone under dynamic load.
Advantageously, described second foam has the velocity correlation spring performance of constant spring constant.This foam is viscoelastic, is also referred to as " crash-active " foam.If collide, because the velocity correlation spring performance, these viscoelastic foams are providing bigger head damping under the higher velocity of impact on headrest, thereby provide better protection for the passenger.
According to a preferred embodiment of the present invention, in the second optional embodiment, impact beam for example is arranged on the lower zone of the headrest in the foams of being made by the mono-foamed materials, wherein impact beam constitutes in the head restraint frame/headrest box of foam base plate or thereon, make in possible collision, change specifically static state or dynamic characteristics with respect to the headrest lower zone of remaining upper area.
In a preferred embodiment, impact beam with static state or dynamic characteristics preferably is integrally formed in head restraint frame/headrest box, perhaps be connected effectively, and be implemented as metal filament, wire gauze, metal sheet, cross section, groove shape cross section or analogue with it.This impact beam can also be constituted as entity or ducted body, for example plastic body or foams, and it can have static state or dynamic characteristics equally.
Can be by providing the headrest that has at first and second foams in the zone, above and below of resting the head in conjunction with the first and second optional embodiment, the front portion in zone above or below wherein said foam is arranged at least.
The zone, above and below of headrest also can be formed by first or second foam with corresponding foam associated dynamic characteristic fully.
No matter be lower zone front portion or whole lower zone is formed by second foam only, can combine according to the additional impact beam with predetermined static similarly or dynamic characteristics of the second optional embodiment is arranged on lower zone.
According to a preferred embodiment of the present invention, in aforesaid optional embodiment, because the head center-of-gravity position on the headrest mating surfaces specifically in the x-z plane of z direction, is considered in Vehicular occupant head cervical vertebra district the moment of torsion M about the y axle
y, it is right to produce a power by force of inertia, and wherein, the right distribution of this power produces the arm of force with respect to the HCG among head respectively in the zone, above and below of headrest.This power is to reducing or eliminate moment of torsion about the y axle fully, thus stable and guiding head.
The present invention each different optional embodiment independent or that combine when bumping, has stablized the head on the head mating surfaces significantly.
The other preferred embodiment of the present invention is quoted as the supplementary features in other appended claims.
Description of drawings
Exemplary embodiment of the present invention is described below with reference to the accompanying drawings, wherein:
Fig. 1 is the figure about the equilibrium of torques of y axle that produces in head center of gravity (HCG);
Fig. 2 is the figure that can select the headrest among the embodiment first, shows the distance definition according to IIHS (highway safety insurance association);
Fig. 3 A is the front elevation of the headrest in first exemplary embodiment of optional embodiment;
Fig. 3 B is the top view according to Fig. 3 A;
Fig. 3 C is the front perspective view according to the headrest among Fig. 3 A and Fig. 3 B;
Fig. 4 A is the cross sectional representation of the headrest in second exemplary embodiment of the second optional embodiment;
Fig. 4 B is the cross sectional representation of the headrest in the 3rd exemplary embodiment of the second optional embodiment;
Fig. 5 is the figure of the 4th exemplary embodiment of the second optional embodiment; And
Fig. 6 is the figure about the equilibrium of torques of y axle that produces in head center of gravity (HCG).
Wherein, sign flag
10 headrests
12 headrest supports
14 head restraint frame/headrest box
16 first foams
18 second foams
20 upper areas
22 lower zones
24 front portions
26 impact beams-wire/mesh
28 impact beams-metal sheet
30 impact beams-cross section
32 impact beams-plastic body
34 impact beams-foams
36 foam base plates (filler)
38 mating surfacess
40 crossbeams
42 drive direction
100 head of passenger (headrest tilts 24 ° relatively)
100 ' head of passenger (headrest tilts 25 ° relatively)
H H dotted line
The T torso line
The extraordinary standard of S1
The standard that S2 is good
The acceptable standard of S3
The standard of S4 difference
The unacceptable standard of S5
A collision rear impact acceleration/accel
The g acceleration due to gravity
The c spring performance
The HWS cervical vertebra
HCG head center of gravity
A point atlas point
Mark x x direction
Mark y y direction
Mark z z direction
X x direction
Y y direction
Z z direction
Power
F
xX direction component
F1
KxFirst power (x direction)
F2
KxSecond power (x direction)
F
zZ direction component
F1
KzFirst power (z direction)
F2
KzSecond power (z direction)
F
GzHead 100 is at the force of inertia of z direction
F
GxHead 100x is at the force of inertia of direction
Moment of torsion
M
yMoment of torsion about the y axle
Distance
k
1xHCG and F1
KzBetween first the distance (x direction)
k
1zHCG and F1
KxBetween first the distance (z direction)
c
1xBetween HCG and the atlas point first distance (x direction)
c
1zBetween HCG and the atlas point first distance (y direction)
k
2xHCG and F2
KzBetween second distance (x direction)
k
2zHCG and F2
KxBetween second distance (z direction)
The specific embodiment
Fig. 1 illustrates the physical basis of thinking processes with reference to the figure of head of passenger (100).The General Definition of this theoretical investigation is included as the head center of gravity (HCG) of the center of gravity of head (100).
According to the direction of setting up, promptly direct of travel of vehicle (x) and vertical direction (z) can determine that at acceleration/accel be a
CollisionThe rear impact process in HCG on the x direction and the mathematics force balance of z direction.
Force balance F on the x direction
xBy the force of inertia F that comes from head (100)
GxIn the opposite direction from the composite force F1 of headrest (10) to head of passenger (100) transmission
KxBetween difference form.
F
x＝F
gx-F1
kx (1)
The force balance F of z direction
zForce of inertia F by head (100)
GzWith composite force F1 that transmits to head of passenger (100) from headrest (10) in the z direction
KzAnd form.
F
z＝F
gz+F1
kz (2)
Then produce equilibrium of torques M about the y axle at a HCG place
y, this equilibrium of torques is by improving with the isolated arm of force of HCG:
M
y＝F1
kz×k
1x+F1
kx×k
1z+F
z×C1
x-F
x×C1
z (3)
Equilibrium of torques (3) is composite force F1
KzAnd F1
KxRespectively with HCG and power F1
KzThe application point between the x direction first apart from k1
xAnd HCG and power F1
KxThe application point between the second distance k1 in the z direction
zProduct, and the pivot rotational force F that acts on the z direction
zWith vertical (level) distance C 1 between HCG and the atlas point (A point)
xProduct and, deduct pivot rotational force F
xAnd the vertical distance C1 between HCG and the atlas point (A point)
zProduct.
From equilibrium of torques M about the y axle according to Fig. 1
yTheory consider beginning, reduce the moment of torsion M of head 100 by the design that changes headrest 10
y, because with solution of the present invention, force balance is respectively with pivot rotational force F
xAnd F
zChange and change.
For explaining that better the present invention, Fig. 2 illustrate the headrest with head restraint frame or headrest box 14, this headrest ends at the head rest pole that is provided with or is connected headrest support 12.Head restraint frame/headrest box 14 parts are arranged in headrest 10, but it is not obvious in Fig. 2, and/or as known to traditional headrest, the head rest pole of being implemented is arranged in the headrest support 12 with adjustable height.
The value record of the top of the headrest 10 that the H point is above is 832mm.Passenger's torso line T is in parallel.
Based on this measurement field, if headrest in measurement field between z direction 60mm and the x direction 70mm, IIHS has specified good value (S2) for the position of headrest.10 scopes that are arranged in measurement field z direction 80mm, x direction 90mm if rest the head on, this position is considered to have the standard (S3) of " can accept ".If headrest is arranged in the scope of measurement field z direction 100mm, x direction 110mm, think the standard (S4) of difference.According to IIHS, the headrest with the value that exceeds these scopes has " unacceptable " standard (S5).Form the headrest of foam base plate 36, because 10 the profile of resting the head on has the z direction less than 55mm and the x direction scope less than 50mm, headrest 10 shown in Figure 2 has the standard (S1) of " very good ".
The whole foam base plate 36 of tradition headrest is formed by same foamed materials.The front portion 24 that the solution of Fig. 2 illustrates headrest 10 is divided into upper area 20 and lower zone 22.
According to the present invention, upper area 20 has first foam 16, and lower zone 22 has second foam 18.In the first optional embodiment of described exemplary embodiment, 16 of first foams forwardly 24 are implemented; Yet first foam 16 also can form the whole upper area 20 of headrest 10.Except according to the IIHS standard about rest the head on 10 and head of passenger between the fabulous condition of distance, if collide, this solution is also respectively in primary importance 100 with the second place 100 ' is stable better and the guiding head of passenger.Certainly, this comprise can be by adopting the midway location of the head of passenger that different foam is resulting, all are not specifically mentioned.
By changing the different qualities of first foam 16 and/or second foam 18, thereby can influence or change this solution.
Advantageously, head 100,100 ' relative velocity also steadily descend in first foam 16, thereby stablize head 100,100 ' in second foam 18, and reduce the whiplash injury effect potentially.With this solution, and by reducing total distance of headrest 10, NIC index (NIC is the neck injury standard) by headrest setting and improve in the S1 standard by 10 the design of resting the head on.
Preferably, the viscoelastic foam with velocity correlation spring performance and constant spring constant c is used as second foam 18.Because its velocity correlation spring performance, the damping of second foam 18 are with head 100,100 ' velocity of impact increases.
Fig. 3 A illustrates the front elevation of the headrest among first embodiment of the second optional embodiment, and Fig. 3 B and 3C further illustrate the top view and the transparent view of headrest 10 from the place ahead.Identical assembly has identical Reference numeral among Fig. 3 A to Fig. 3 C.Headrest 10 has the head restraint frame 14 that transition enters headrest support 12.In the second optional embodiment, for instance, headrest 10 is manufactured to the foam base plate of being made by single foamed materials 36, but also can be made of multiple foamed materials according to the first optional embodiment.Impact beam is arranged on the lower zone 22 of headrest 10, and it is plastic body 32 or foams 34 at Fig. 3 A in Fig. 3 C.
Fig. 3 A illustrates and is respectively insert type plastic body 32 and the foams 34 that are inserted in the head restraint frame 14.By selecting the plastics or the foam of different materials, no matter static state or dynamic characteristics can both obtain at the lower zone 22 of headrest 10.Impact beam forms the embolus of two-part structure here.A part of structure that also can adopt obtains by impact beam is integrally formed in the head restraint frame.
Fig. 3 B represents the top view of resting the head on, and shows to be arranged on head restraint frame 14 in-to-ins for improving the crossbeam 40 of stability, with plastic body 32 that is arranged on head restraint frame 14 the place aheads or foams 34, as driving direction 42 findings.
If collide, because its static or its dynamic characteristics, headrest 10 reduces the moment of torsion M at head of passenger 100,100 ' rear portion
y, as describing with reference to the first optional embodiment.
The characteristic of second foam of describing with reference to Fig. 2 also is applicable to the characteristic of foams 34 usually.
Fig. 3 C illustrates the transparent view of impact beam 32,34 once more with identical Reference numeral, and this impact beam 32,34 can be connected to or be formed on or be integrated on the head restraint frame 14.
Fig. 5 illustrates the embodiment with the whole impact beam in headrest box 14.
Fig. 4 A illustrates the cross sectional representation of second exemplary embodiment of headrest 10 the second optional embodiment, and impact beam is made of tubular section (tubular profile) 30.The tubular section is arranged on the lower zone 22 of headrest.The impact beam 30 that the tubular section forms and the headrest 10 that is formed on upper area 20 cause " contact " in lower zone at 2.Headrest 10 here forms as the second top mating surfaces by first or second foam 16,18 and head restraint frame 14.
In the 3rd exemplary embodiment of the second optional embodiment, Fig. 4 B illustrates the cross sectional representation of the headrest 10 that another impact beam made from metal sheet 28 constitutes.Metal sheet is arranged on the lower zone 22 of headrest." 2 contact " at lower zone that this also causes an impact beam 34 of being made by metal sheet and zone 20 headrests that form 10 up to form, it here also is as the second top mating surfaces formation by first or second foam 16,18 and head restraint frame 14.
In this example, tubular section 30 or metal sheet 28 are formed on or are connected on the head restraint frame 14 in mating surfaces 38 zones, preferably reach 16mm at the interval of mating surfaces 38 times and mating surfaces 38, thereby form impact beam in the lower zone of headrest 10.Head restraint frame 14 can have the additional crossbeam 40 of the point of connection that can also be used as tubular section 30 (Fig. 4 A) or metal sheet 28 (Fig. 4 B).
Though combining between first and second foams 16,18 in upper area 20 and/or the lower zone 22 and the impact beam 26,28,30,32,34 is part of the present invention, do not illustrate in the accompanying drawings.
Get back to Fig. 2 now, remove preferred viscoelastic foam characteristic, additional impact beam 26,28,30,32,34 can also be set to the mating surfaces 38 of approaching headrest 10 in second foam 18 of lower zone 22.By this method,, can increase the extra useful dynamic and static effect of headrest 10 because additional impact beam 26,28,30,32,34 can have static response and dynamic characteristics respectively.
At last, Fig. 5 illustrates first exemplary embodiment of the second optional embodiment, and wherein impact beam 32 is integrally formed in the lower zone 22 of headrest box 14.For example, impact beam 32 can be the part of the headrest box 14 made of plastics, and can have any suitable shape, and this shape provides second strong point for the head on the headrest below the height of gravitational center 10 in foam base plate 36.
Fig. 6 illustrates and has also described the described effect that forms mating surfaces 38 or form the solution of the strong point in the lower zone 22 of headrest 10 mathematics, compares with Fig. 1, and this effect comprises the moment of torsion M of change about y axle (y-y)
yPower right.
According to Fig. 5, because introduced other force vectors in the equation of describing equilibrium of torques, (optional embodiment) compared to Figure 1 reduced moment of torsion with reference to the described solution of Fig. 2 to the 4C.
Based on power F
xAnd F
zEquation of equilibrium (4) and (5), at the equilibrium of torques M of a HCG about the y axle
yThen be (6):
F
x＝F
gx-F1
kx-F2
kx (4)
F
z＝F
gz+F1
kz+F2
kz (5)
M
y＝F1
kz×k1
x+F1
kx×k1
z+F2
kz×k2
x-F2
kx×k2
z+F
z×C1
x-F
x×C1
z (6)
Equilibrium of torques is power F1
KzAnd F1
KxRespectively with HCG and power F1
KzThe application point between the x direction first apart from k1
xAnd HCG and power F1
KxThe application point between at the second distance k1 of z direction
zProduct, and the force of inertia F that acts on the z direction
zAnd the horizontal throw C1 between HCG and the atlas point (A point)
xProduct and, deduct force of inertia F
xAnd the vertical distance C1 between HCG and the atlas point that coexists (A point)
zProduct, wherein, the product F2 of value
Kz* k2
x-F2
Kx* k2
zRepresentative is respectively at the component of z direction and x direction contribution moment of torsion.
At equilibrium of torques M
yIn, aforementioned solution provide basically the lower zone 22 of headrest 10, as with the product of the relevant second distance that the originates in HCG vertical forces F2 of introducing in addition
Kz, and introduce in addition the relevant second distance k2 that originates in HCG that has that goes into
zHorizontal direction power F2
Kx, offset force of inertia F respectively
GxAnd F
Gz
If the institute in the equation (6) cancels out each other effectively, then moment of torsion M
yEliminated fully, therefore the whiplash injury effect is also eliminated fully.Although the unknown external force when taking place with collision owing to passenger's size is different, and also because the distance between the mating surfaces 38 of headrest 10 and the head of passenger 100,100 ' (is seen measurement field, Fig. 2), even under the same conditions, for all possible collision and passenger, thisly be reduced to zero and can not repeat to reach, but, can advantageously reduce the residual torque M on the y-y axle at least by the present invention
y
Claims (14)
1. a headrest (10), be used for seat, specifically be used for motor vehicle seat back, described headrest comprises head restraint frame/headrest box (14) and centers on the foam base plate (36) of described head restraint frame/headrest box (14), impact if automobile rear wherein takes place, promptly the tradition headrest is fixing with respect to described backrest for described headrest, and perhaps the part of described at least headrest is shifted to Vehicular occupant immediately and promptly activated headrest, it is characterized in that, for reducing or offsetting the moment of torsion M of cervical vertebra district about the y axle
y, and prevent that contingency from damaging the seat passenger, especially prevent the whiplash injury of impact moment of cervical syndrome and/or front and/or rear, the head of Vehicular occupant can be moved with two differing heights (k1 at headrest (10) at least
z, k2
z) contact with headrest (10), i.e. 2 supports, thereby at these (k1 highly of headrest (10)
z, k2
z) between form head center of gravity (HCG).
2. headrest according to claim 1 is characterized in that, and is described at least two differing heights (k1
z, k2
z) cross a zone with contacting of headrest (10), along a line or produce on one point.
3. headrest according to claim 1 and 2 is characterized in that, is guiding head, and minimizing or counteracting cervical vertebra district are about the moment of torsion M of y axle
yPrevent that contingency from damaging the seat passenger, especially prevent cervical syndrome and/or the front and/or rear impact whiplash injury of moment, the foam base plate (36) of described headrest (10), at least in the front portion (24) of foam base plate (36), and thereby when take place colliding, stablizing head (100,100 ') on the mating surfaces (38), made by first foam (16) of the upper area that is substantially disposed in headrest (10) (20) and second foam (18) that is substantially disposed in the lower zone (22) of headrest (10), wherein said foam has different dynamic characteristicss.
4. headrest according to claim 3 is characterized in that, described foam (16,18) has different density and/or steadiness and/or viscosity, therefore has different dynamic characteristicss.
5. headrest according to claim 4 is characterized in that, described first foam (16) is compared with second foam (18) has lower viscosity and less steadiness.
6. headrest according to claim 5 is characterized in that, described second foam (18) is the viscoelastic foam with velocity correlation spring performance and constant spring constant c.
7. headrest according to claim 6 is characterized in that, because the velocity correlation spring performance, described second foam (18) is that viscoelastic foam is providing bigger head (100 ') damping under the higher speed on headrest (10).
8. headrest according to claim 1 and 2 is characterized in that, is guiding head, and minimizing or counteracting cervical vertebra district are about the moment of torsion M of y axle
yPrevent that contingency from damaging the seat passenger, especially prevent cervical syndrome and/or the front and/or rear impact whiplash injury of moment, inner at foam base plate (36) near the lower zone (22) of when bumping, stablizing the headrest (10) that the head mating surfaces of (100,100 ') (38) locates, impact beam (26,28,30,32,34) be arranged in the head restraint frame/headrest box (14) of headrest (10) or on it.
9. headrest according to claim 8 is characterized in that, described impact beam is metal filament or wire gauze (26), metal sheet (28), cross section (30) or plastic body (32), or foams (34), or analogue.
10. headrest according to claim 6 is characterized in that, described impact beam is integrally formed in head restraint frame/headrest box (14) and is one, perhaps is connected promptly two with head restraint frame/headrest box (14).
11. headrest according to claim 6, it is characterized in that, described impact beam is designed to the foams (34) in head restraint frame/headrest box (14), and have character according to described second foam of claim 4 to 7 (18), and foam base plate (36) is corresponding to according to described first foam of claim 4 to 7 (16).
A 12. headrest (10), be used for seat, specifically be used for motor vehicle seat back, this headrest comprises head restraint frame (14) substantially and centers on the foams of this head restraint frame (14), if the impact on the automobile rear wherein takes place, promptly the tradition headrest is fixing for the relative backrest of resting the head on, and perhaps the part of described at least headrest is shifted to Vehicular occupant immediately and promptly activated headrest, it is characterized in that described headrest (10) may be embodied as the combination of claim 3 and 8.
13. headrest according to claim 12 is characterized in that, has the feature of claim 2 to 7 and 9 to 12.
14. according to claim 1,3,8 or 12 described headrests, it is characterized in that, by at head (100,100 ') in the motion process on x-z plane, from the headrest (10) head center of gravity (HCG) apply with force of inertia (F
Gz) and (F
Gx) opposite have the corresponding arm of force (k respectively
1z, k
1x) and (k
2z, k
2x) power to (F1
Kx, F1
Kz) and (F2
Kx, F2
Kz), guiding head, and the cervical vertebra district is about the moment of torsion (M of y axle (y-y)
yTherefore) be reduced or offset, thereby prevent that rear impact from damaging the seat passenger, especially about the cervical syndrome and/or the whiplash injury of Vehicular occupant.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005030313.7A DE102005030313B4 (en) | 2005-06-23 | 2005-06-23 | Whiplash optimized headrest |
| DE102005030313.7 | 2005-06-23 | ||
| PCT/EP2006/062557 WO2006136485A1 (en) | 2005-06-23 | 2006-05-24 | Headrest for protecting against whiplash |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101203401A true CN101203401A (en) | 2008-06-18 |
| CN101203401B CN101203401B (en) | 2010-10-27 |
Family
ID=36809253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800223662A Expired - Fee Related CN101203401B (en) | 2005-06-23 | 2006-05-24 | Headrest for protecting against whiplash |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7926871B2 (en) |
| EP (1) | EP1896291B1 (en) |
| CN (1) | CN101203401B (en) |
| DE (1) | DE102005030313B4 (en) |
| WO (1) | WO2006136485A1 (en) |
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-
2005
- 2005-06-23 DE DE102005030313.7A patent/DE102005030313B4/en not_active Expired - Fee Related
-
2006
- 2006-05-24 CN CN2006800223662A patent/CN101203401B/en not_active Expired - Fee Related
- 2006-05-24 WO PCT/EP2006/062557 patent/WO2006136485A1/en active Application Filing
- 2006-05-24 EP EP06763249.7A patent/EP1896291B1/en active Active
- 2006-05-24 US US11/993,626 patent/US7926871B2/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101992715A (en) * | 2009-08-18 | 2011-03-30 | 格瑞玛股份公司 | Headrest |
| CN104661864A (en) * | 2012-09-25 | 2015-05-27 | 丰田自动车株式会社 | Headrest and vehicle seat provided with same |
| CN111660898A (en) * | 2013-11-27 | 2020-09-15 | 约翰逊控股公司 | Motor vehicle seat |
| CN113646208A (en) * | 2019-04-02 | 2021-11-12 | 盖斯廷德股份有限公司 | Vehicle seat |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102005030313A1 (en) | 2006-12-28 |
| EP1896291A1 (en) | 2008-03-12 |
| US7926871B2 (en) | 2011-04-19 |
| EP1896291B1 (en) | 2017-11-15 |
| DE102005030313B4 (en) | 2016-02-04 |
| US20100072795A1 (en) | 2010-03-25 |
| WO2006136485A1 (en) | 2006-12-28 |
| CN101203401B (en) | 2010-10-27 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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Granted publication date: 20101027 |